the act of reducing or the state of being reduced.
the amount by which something is reduced or diminished.
a form produced by reducing a copy on a smaller scale.
Cell Biology. meiosis, especially the first meiotic cell division in which the chromosome number is reduced by half.
Chemistry. the process or result of reducing.
Movies. the process of making a print of a narrower gauge from a print of a wider gauge: the reduction of 35-millimeter films to 16-millimeter films for the school market.
a village or settlement of Indians in South America established and governed by Spanish Jesuit missionaries.
Origin of reduction
First recorded in 1475–85; earlier reduccion, from Middle French reduction, from Latin reductiōn- (stem of reductiō ) “a bringing back,” equivalent to reduct(us) (past participle of redūcere “to lead back” ) + -iōn- noun suffix; see reduce, -ion
Sure enough, the average change in diastolic blood pressure was a clinically significant reduction of five mmHg, which is good news.
Why Altitude Training Helps Some but Not Others|Alex Hutchinson|September 11, 2020|Outside Online
Driven by environmental concerns, Kim-Parker saw an opportunity to create a space that would aid in the reduction of pollution in the fashion landscape.
The CEO striving to make vintage, secondhand clothing as popular as fast fashion|Rachel King|September 6, 2020|Fortune
Those reductions would mean much longer wait times and more crowded buses and subways.
New York City transit needs a $12 billion bailout—or the entire U.S. economic recovery may suffer|dzanemorris|September 3, 2020|Fortune
The potential for future reductions in the cost of electricity from silicon solar, for example, is limited.
How a New Solar and Lighting Technology Could Propel a Renewable Energy Transformation|Sam Stranks|September 3, 2020|Singularity Hub
The housing authority agreed to lower Brown’s rent to $318 a month but said the reduction would not take effect until March.
She Was Sued Over Rent She Didn’t Owe. It Took Seven Court Dates to Prove She Was Right.|by Danielle Ohl, Capital Gazette, and Talia Buford and Beena Raghavendran, ProPublica|August 25, 2020|ProPublica
Does that mean a reduction in policing would be a good thing?
Ground Zero of the NYPD Slowdown|Batya Ungar-Sargon|January 1, 2015|DAILY BEAST
Like many I spoke to, Williams seemed to desire a reorientation of policing, rather than just a reduction.
Ground Zero of the NYPD Slowdown|Batya Ungar-Sargon|January 1, 2015|DAILY BEAST
Proper use could lead to weight loss and reduction in gastric reflux.
Nothing Says I Love You Like Data|The Daily Beast|December 8, 2014|DAILY BEAST
The reduction in the unemployment levels is largely due to part time jobs and more people simply giving up looking for jobs.
Voters Remind D.C. That the Economy Still Sucks|Stuart Stevens|November 6, 2014|DAILY BEAST
First, the reduction of war to a football statistic; but second and more meaningfully, because we all knew what that “1” was.
Can America Still Win Wars?|Michael Tomasky|October 4, 2014|DAILY BEAST
Hence, the reduction of all that paganism was deemed impracticable.
The Philippine Islands, 1493-1898|Various
This reduction may have been due to improvements effected in organization as the result of experience.
The Crisis of the Naval War|John Rushworth Jellicoe
But we cannot be content with this measure of reduction of the infinity of experience.
Language|Edward Sapir
Moving away from the camera means a reduction much greater than a mere stepping to the background on the theater stage.
The Photoplay|Hugo Mnsterberg
There should be some reduction and it may be modification in the grain for a short time.
Pratt's Practical Pointers on the Care of Livestock and Poultry|Pratt Food Co.
British Dictionary definitions for reduction
reduction
/ (rɪˈdʌkʃən) /
noun
the act or process or an instance of reducing
the state or condition of being reduced
the amount by which something is reduced
a form of an original resulting from a reducing process, such as a copy on a smaller scale
a simplified form, such as an orchestral score arranged for piano
maths
the process of converting a fraction into its decimal form
the process of dividing out the common factors in the numerator and denominator of a fraction; cancellation
The changing of a fraction into a simpler form, especially by dividing the numerator and denominator by a common factor. For example, the fraction 812 can be reduced to 46, which can be further reduced to 23, in each case by dividing both the numerator and denominator by 2.
A chemical reaction in which an atom or ion gains electrons, thus undergoing a decrease in valence. If an iron atom having a valence of +3 gains an electron, the valence decreases to +2. Compare oxidation.
Usage
Beginning students of chemistry are understandably puzzled by the term reduction: shouldn't a reduced atom or ion be one that loses electrons rather than gains them? The reason for the apparent contradiction comes from the early days of chemistry, where reduction and its counterpart, oxidation, were terms invented to describe reactions in which one substance lost an oxygen atom and the other substance gained it. In a reaction such as that between two molecules of hydrogen (2H2) and one of oxygen (O2) combining to produce two molecules of water (2H2O), the hydrogen atoms have gained oxygen atoms and were said to have become oxidized, while the oxygen atoms have (as it were) lost them by attaching themselves to the hydrogens, and were said to have become reduced. Importantly, though, in the process of gaining an oxygen atom, the hydrogen atoms have had to give up their electrons and share them with the oxygen atoms, while the oxygen atoms have gained electrons. Thus comes the apparent paradox that the reduced oxygen has in fact gained something, namely electrons. Today the terms oxidation and reduction are used of any reaction, not just one involving oxygen, where electrons are (respectively) lost or gained.